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Collection of Residential Shower and Bathtub
Gray Water for Reuse to Flush Toilets
and for IrrigationAn Experimental Project
Kenneth Garges
Gray Water
• Collected from bathtub and shower drains.
• NOT potable.
• Quickly fouls if stored.
• Fresh gray water can be used for subsurface irrigation but not sprayed.
• Not pure enough for toilets.
Filtering Gray Water
• Commercial systems are very expensive.
• Example: Flowtender price $3840 - $18,968
A New Simpler System• Collection in recycled 55 gallon drums.
• Spun polypropylene mesh pre-filter.
• Slow sand (aka biosand) filter modeled after Center for Affordable Water and Sanitation Technology (CAWST), a non-profit delivering water treatment systems to developing countries.
• Pump controlled by Arduino to keep storage brief by draining stale gray water.
Current Project Status• Collection tank plumbed to shower drains
• Filtration tank completed, running for 20 days (CAWST recommends at least 30 before using filtered water)
• Filtered water storage tank completed but not plumbed to building toilets
• Controller hardware finished
• Software still in progress